I have a 2003 Mean Streak, when I bought it I put on a 180 rear Dunlop right away, it also matched the tread of the front tire. Anyways I'd like to get my rims chromed and then put on a 190 in the rear but what one? Anyone have this on their bike?? I also found this on the net and copied it, might be worth reading? So what's your advice on the 190? "We often get questions from consumers interested in purchasing tires. The most common question is, "Will a certain size fit on my bike?" Well, let me take a moment to address this. First, you can never go wrong with replacing your "worn-out" stock tires with the same size tires. Manufacturers do a lot of R&D in this area and chose the tire sizes on you bike for a reason. However, in some cases, you can make small substitutes to create a desired change in your bike's handling. Notice: I did not mention "desired look." A lot of my customers want to add a wider rear tire for the purposes of "looking cool." Well, wider tires, in most cases, slow the bikes performance. A wider tire usually makes the bike more difficult to turn, thus slowing the bikes "left-right" handling. I know what your thinking......but a wider tire will give me a larger contact patch; thus more rear grip. Well, yes and no. This depends on the rim width and tire sidewall size. For example, you have a GSXR600 with a 180/55-17 stock rear tire. Your rim is probably 5.5 inches wide. You could replace the 180 with a 190, but your bike will turn slower. But you want a larger contact patch, well why not replace your 180/55-17 with a 190/55-17 instead of a 190/50-17? The key here is the taller sidewall (55 instead of 50). This is a common approach used by racers, The taller sidewall will allow the tire to grow more, thus creating a larger contact patch. The downside, a taller tire will significantly affect your suspension. You will need to make adjustments in this area. Now, several other issues arise from upgrading to a larger tire, the most obvious is an increase in weight. You say, " a pound or two is not big deal." Well, on a wheel your not just talking about static weight, your talking about cyntrifical and gyroscopical weight. Cyntrifical forces are generated by the rotation of mass (forward motion of your wheels). The more weight your motor needs to turn, the more energy (power) is needed to turn this weight. Gyroscopical forces are determined by the side-side motion of a spinning object (ie spinning top). In bike terms, the movement of your bike from side-side while in forward motion. Physics dictates that more force is needed to change directions the greater the spinning mass is. Last, let me mention mounting a larger tire. Manufacturers decide on a formula that maximizes grip by combining weight and contact patch area to its optimum advantage. By trying to install a tire that is simply to wide for your rim, you will not be able to utilize the full area of the tire. Let me explain, consider squeezing a tire at its bead. The tighter you squeeze, the more "flared out" the treaded part of tire becomes. Now imagine that tire in a rim being squeezed by a small rim. With the tire all flared out, how much of that tire do you think will actually be used? This is why changing more than one tire size is fruitless; you'll never use all of this large of a tire. Now, I ramble on for a bit and my explanations were very simple and basic. I did this so that the average "Joe" could understand. For a more in depth explanation of these principles, you can find information through one of the major tire manufacturers like Dunlop or Pirelli. I hope this helps!"